Recovery of Metal from Iron-chromium Residue by Means of Solvent Extraction
溶剂萃取法提取电镀污泥氨浸出渣中的金属资源

A solvent extraction process for valuable metals recovery from residue left ammonia carbonate leaching of plating sludge has been developed.This process include sulfuric leaching of the residue,separation of Fe3+ using PC-88A-kerosene-H2SO4 extraction system,co-extraction of Cr3+ and Al3+ using saponated D2EHPA-kerosene-H2SO4 extraction system and stripping separation of Cr3+ and Al3+.The optimum operation parameters of each unit were determined in laboratory.The results showed that the recovery rates of chromium,aluminum and iron are all more than 95%.CrCl3·6H2O,Al2(SO4)3·18H2O and FeCl3·6H2O with high purity were obtained in this process and could be used as chemical reagents.